package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前商品购物车中是否已有
    ShoppingCart shoppingCart=new ShoppingCart();
    BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
    Long userId = BaseContext.getCurrentId();
    shoppingCart.setUserId(userId);
    List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //已有，则只需购物车表中数量加一 即更新操作
     if(list!=null&&list.size()>0){
         ShoppingCart cart = list.get(0);
         cart.setNumber(cart.getNumber()+1);
         shoppingCartMapper.updateNumberById(cart);
     }
    //没有，插入一条购物车数据
        else{
           //判断本次添加到购物车的是菜品or套餐
         Long dishId = shoppingCartDTO.getDishId();
         if(dishId!=null){
             Dish dish = dishMapper.getById(dishId);
             shoppingCart.setImage(dish.getImage());
             shoppingCart.setName(dish.getName());
             shoppingCart.setAmount(dish.getPrice());
         }
         else{
               Long setmealId = shoppingCartDTO.getSetmealId();
               Setmeal setmeal = setmealMapper.getById(setmealId);
               shoppingCart.setImage(setmeal.getImage());
               shoppingCart.setName(setmeal.getName());
               shoppingCart.setAmount(setmeal.getPrice());
         }
         shoppingCart.setNumber(1);
         shoppingCart.setCreateTime(LocalDateTime.now());
         shoppingCartMapper.insert(shoppingCart);


     }
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                        .userId(userId)
                        .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }
//   清空购物车
    @Override
    public void cleanShoppingCart() {
         Long userId = BaseContext.getCurrentId();
         shoppingCartMapper.deleteByUserId(userId);
    }
    /*减少购物车*/
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //查询当前用户
        Long userId = BaseContext.getCurrentId();
        //查询该用户的购物车
        ShoppingCart shoppingCart=ShoppingCart.builder()
                        .userId(userId)
                        .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果数量>1只需改数量即可
        if(list!=null&&list.size()>0){
            ShoppingCart cart = list.get(0);
            if(cart.getNumber()>1)
            {
                cart.setNumber(cart.getNumber()-1);
                shoppingCartMapper.updateNumberById(cart);
            }
            //数量=1 把这条数据删除
            else{
                shoppingCartMapper.deleteById(cart.getId());
            }
        }

        }

    }


